Physics Letters A最新文献_第7页

Functionalities of Au2O, Au2O3, Au2O3-x, and nanosheets, including spontaneous polarization, using DFT and hybrid functional Au2O, Au2O3， Au2O3-x和纳米片的功能，包括自发极化，使用DFT和杂化功能

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-13 DOI: 10.1016/j.physleta.2026.131367

Yukio Watanabe

{"title":"Functionalities of Au2O, Au2O3, Au2O3-x, and nanosheets, including spontaneous polarization, using DFT and hybrid functional","authors":"Yukio Watanabe","doi":"10.1016/j.physleta.2026.131367","DOIUrl":"10.1016/j.physleta.2026.131367","url":null,"abstract":"<div><div>We used density functional theories (DFT) to investigate the properties of Au<sub>2</sub>O and Au<sub>2</sub>O<sub>3-</sub><em><sub>x</sub></em> (<em>x</em> = 0–0.08) to reveal their remarkable functionikalities. Hybrid functional theories accurately estimate the band gap (<em>E</em><sub>g</sub>) of oxides, and the present hybrid functional calculations determined <em>E</em><sub>g</sub> values of 0.96 eV for Au<sub>2</sub>O and 2.86 eV for Au<sub>2</sub>O<sub>3</sub>, which is >300% of the commonly accepted <em>E</em><sub>g</sub> of Au<sub>2</sub>O<sub>3</sub> (0.85 eV). Moreover, we discovered spontaneous polarization (<em>P</em><sub>S</sub>) in Au<sub>2</sub>O<sub>3</sub>, which is unusually large and advantageous for catalysis. The <em>P</em><sub>S</sub> was retained even in 2-nm-thick Au<sub>2</sub>O<sub>3</sub> nanosheets, similar to hyperferroelectric, generating a potential of 0.6 eV despite screening caused by surface reconstruction, which is a novel screening mechanism. Below a thickness of 0.8 nm, the <em>P</em><sub>S</sub> vanished, and inversion symmetry emerged at 0.4 nm, suggesting a new approach to finding a paraelectric phase. Au<sub>2</sub>O was supersoft under shear distortion.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131367"},"PeriodicalIF":2.6,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of impurity ions on interplay between turbulence, mean and zonal flows in toroidal magnetized plasmas 杂质离子对环形磁化等离子体湍流、平均流和纬向流相互作用的影响

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-16 DOI: 10.1016/j.physleta.2026.131383

Q. Zou , J. Cheng , Z.B. Shi , Y. Xu , L.W. Yan , X. Chen , J. Chen , L. Liu , Z.H. Huang , N. Wu , W.C. Wang , R.X. Huang , Z.S. Shi , C.F. Dong , X.Q. Ji , W.L. Zhong

{"title":"Effect of impurity ions on interplay between turbulence, mean and zonal flows in toroidal magnetized plasmas","authors":"Q. Zou , J. Cheng , Z.B. Shi , Y. Xu , L.W. Yan , X. Chen , J. Chen , L. Liu , Z.H. Huang , N. Wu , W.C. Wang , R.X. Huang , Z.S. Shi , C.F. Dong , X.Q. Ji , W.L. Zhong","doi":"10.1016/j.physleta.2026.131383","DOIUrl":"10.1016/j.physleta.2026.131383","url":null,"abstract":"<div><div>The effect of impurity ions on turbulence, mean and zonal flow dynamics has been studied in HL-2A ohmically-heated deuterium plasmas by a combined Langmuir probe array. Results show that the fluctuating level of geodesic acoustic mode (GAM) zonal flows has an obvious reduction, while the GAM frequency remains nearly unchanged after the impurity injection. Further analysis demonstrates that with impurity injection the GAM zonal flows gain less energy from the high frequency fluctuations in 300-500 kHz due to the reduction of eddies titling angle and shape stretched by E × B mean flow through the so-called vortex thinning process, concurrently the turbulent transport concentrated in 15-100 kHz increases, indicating that electrostatic fluctuations driving zonal flows and fluctuations responsible for the particle transport originate from different instabilities. These experimental results reveal the critical role of <span><math><mrow><mi>E</mi><mo>×</mo><mi>B</mi></mrow></math></span> mean flow in mediating the inverse cascade from small scale turbulence to large scale zonal flows as well as its coupling with turbulent transport. This study could advance our understanding of fundamental physics on the multi-scale interaction and its implication for controlling turbulent transport through impurity ions in future fusion plasmas.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131383"},"PeriodicalIF":2.6,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Full counting statistics of charge and energy transport through a double quantum dot system beyond secular approximation 超越长期近似的双量子点系统中电荷和能量输运的全计数统计

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-16 DOI: 10.1016/j.physleta.2026.131347

Biao Fan , Mengjie Tong , Yuguo Su , Gabriel Ouma Paul , Francis Okoth Awiti , Elijah Omollo Ayieta , Szabolcs Kelemen , Feng Zhai , Junyan Luo

{"title":"Full counting statistics of charge and energy transport through a double quantum dot system beyond secular approximation","authors":"Biao Fan , Mengjie Tong , Yuguo Su , Gabriel Ouma Paul , Francis Okoth Awiti , Elijah Omollo Ayieta , Szabolcs Kelemen , Feng Zhai , Junyan Luo","doi":"10.1016/j.physleta.2026.131347","DOIUrl":"10.1016/j.physleta.2026.131347","url":null,"abstract":"<div><div>A deep understanding of coherent transport through a double quantum dot (DQD) is essential to the design of a quantum device. In this work, we investigate the nonequilibrium transport of particles and energy through a DQD by employing the full counting statistics framework, which is established based on a generalized quantum master equation (GQME) without the secular approximation. We demonstrate the unique advantage of our approach in the regime of small interdot couplings, where quantum coherence gives rise to a strong charge localization in the DQD, leading intriguingly to a prominent super-Poissonian noise. We reveal that the frequency-dependent noise of the energy current is a sensitive indicator of quantum coherence, which offers the possibility to identify the bath-induced or the tunnel coupling-induced decoherences. These findings highlight the importance of utilizing a GQME without the secular approximation for an appropriate description of energy and charge transport through DQD devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131347"},"PeriodicalIF":2.6,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring magnetic, dielectric relaxation and magneto-dielectric coupling in monoclinic double perovskite Pr2NiMnO6 单斜双钙钛矿Pr2NiMnO6的磁、介电弛豫和磁介电耦合研究

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-12 DOI: 10.1016/j.physleta.2026.131364

Salma Alshehri , G.S. AlGhamdi , Fatmah A. Al-Marhaby , Dalal S. Bayahia , Badriah Sultan , M.D. Alshahrani , Saleha Qissi , Zaina S. Algarni , Faten A.M. Abdelaziz , Mohammad Shariq

{"title":"Exploring magnetic, dielectric relaxation and magneto-dielectric coupling in monoclinic double perovskite Pr2NiMnO6","authors":"Salma Alshehri , G.S. AlGhamdi , Fatmah A. Al-Marhaby , Dalal S. Bayahia , Badriah Sultan , M.D. Alshahrani , Saleha Qissi , Zaina S. Algarni , Faten A.M. Abdelaziz , Mohammad Shariq","doi":"10.1016/j.physleta.2026.131364","DOIUrl":"10.1016/j.physleta.2026.131364","url":null,"abstract":"<div><div>This work investigates the dielectric, magnetic, and magneto-dielectric properties of the monoclinic bulk double perovskite Pr<sub>2</sub>NiMnO<sub>6</sub> (PNMO) as a function of frequency and temperature. Below 100 K, the dielectric permittivity remains nearly frequency-independent, while increasing temperature gives rise to distinct relaxation peaks within 997 Hz to 997,999 Hz. The dielectric loss (tan δ) spectra display progressively enhanced peak intensities between 112 K and 197 K, revealing a frequency-dependent relaxation process. These sharp relaxation features indicate a relaxor-like dielectric behavior, primarily arising from molecular dipoles in PNMO. The relaxation dynamics are attributed to electron hopping between transition-metal ions, consistent with the Maxwell–Wagner interfacial polarization model. Cole–Cole fitting analysis further provides insights into dielectric strength, conductivity, and distribution parameters. The interplay of dielectric and magneto-dielectric responses underscores PNMO’s potential for multifunctional applications, including spintronic devices, sensors, and energy storage systems, where coupled electric and magnetic functionalities are desirable.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131364"},"PeriodicalIF":2.6,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

FMSTA-Net: Fractional mode recognition of cylindrical vector beams via multi-scale turbulence-aware learning and polarization analysis FMSTA-Net：基于多尺度湍流感知学习和偏振分析的圆柱矢量光束分数阶模式识别

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-13 DOI: 10.1016/j.physleta.2026.131369

Pengfei Wu , Zetong Wang , Sichen Lei , Xiaofan Wang , Zhenkun Tan , Jiao Wang , Yiwei Sun

{"title":"FMSTA-Net: Fractional mode recognition of cylindrical vector beams via multi-scale turbulence-aware learning and polarization analysis","authors":"Pengfei Wu , Zetong Wang , Sichen Lei , Xiaofan Wang , Zhenkun Tan , Jiao Wang , Yiwei Sun","doi":"10.1016/j.physleta.2026.131369","DOIUrl":"10.1016/j.physleta.2026.131369","url":null,"abstract":"<div><div>To address the mode recognition challenges of fractional cylindrical vector beams (FCVBs) under atmospheric turbulence, including spot diffusion, uneven energy distribution, deformation of ring or stripe structures, and strong similarity between conjugate fractional orders, a model named FMSTA-Net is proposed. This network, combined with a Multi-Scale Turbulence-Aware Attention (MSTA) module, which innovatively integrates hierarchical feature extraction across point, local, medium-range, and global scales, effectively captures both fine-grained distortions and global structural dependencies under varying turbulence conditions. Experimental results demonstrate that, under six atmospheric turbulence levels with refractive index structure constants ranging from <span><math><mrow><msubsup><mi>C</mi><mi>n</mi><mn>2</mn></msubsup><mo>=</mo><mn>1</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>16</mn></mrow></msup><msup><mrow><mi>m</mi></mrow><mrow><mo>−</mo><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msup></mrow></math></span> to <span><math><mrow><msubsup><mi>C</mi><mi>n</mi><mn>2</mn></msubsup><mo>=</mo><mn>5</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>14</mn></mrow></msup><msup><mrow><mi>m</mi></mrow><mrow><mo>−</mo><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msup></mrow></math></span>, the model achieves a recognition accuracy of 99.3 % for FCVBs within the OAM range of [±3.1, ±4.0] transmitted over a distance of 1000 meters. In classification tasks with order intervals of 0.05 and 0.15, accuracies of 96.4 % and 98.4 %, respectively, are achieved. Furthermore, on additional test sets at transmission distances of 750 m and 1250 m, FMSTA-Net attains recognition accuracies of 99.2 % and 95.4 %, demonstrating excellent generalization capability and robustness for practical deployment in turbulent atmospheric channels.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131369"},"PeriodicalIF":2.6,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamically stable two-mode squeezing in cavity optomechanics 腔光力学中的动态稳定双模压缩

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-15 DOI: 10.1016/j.physleta.2026.131372

Chen Wang, Shi-Fan Qi

引用次数: 0

Pascal’s triangle and quantum entanglement 帕斯卡三角形和量子纠缠

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-09 DOI: 10.1016/j.physleta.2026.131350

Asma Al-Qasimi

引用次数: 0

A generalization of the beam problem: Connection to multi-component Camassa-Holm dynamics 束问题的推广：与多分量Camassa-Holm动力学的联系

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-10 DOI: 10.1016/j.physleta.2026.131351

Richard Beals , Jacek Szmigielski

引用次数: 0

The phase transition and thermodynamic properties of beryllium at high temperatures and pressures 铍在高温高压下的相变和热力学性质

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-14 DOI: 10.1016/j.physleta.2026.131368

Duong Dai Phuong , Hua Xuan Dat

{"title":"The phase transition and thermodynamic properties of beryllium at high temperatures and pressures","authors":"Duong Dai Phuong , Hua Xuan Dat","doi":"10.1016/j.physleta.2026.131368","DOIUrl":"10.1016/j.physleta.2026.131368","url":null,"abstract":"<div><div>Beryllium (Be) is an alkaline earth metal that plays an important role in the aerospace and nuclear industries. Today, with advanced and modern technology, scientists have discovered that Be exists in two phases: body-centred cubic (BCC) and hexagonal close-packed (HCP). The BCC - Be is stable under extreme conditions up to 1000 GPa. The phase transition pressure of Be from the hexagonal close-packed (HCP) structure to the body-centred cubic (BCC) structure occurs within the range of 386 GPa at <em>T</em> = 300 K. Here, we use the statistical moment method to construct the equation of state and the multiphase thermodynamic properties of Be at high pressures. And, we determine the phase-transition pressure of Be through the Gibbs thermodynamic potential, along with structural and thermodynamic quantities such as density, volume, thermal expansion coefficient, entropy, isochoric and isobaric heat capacities, and the Debye temperature of Be, while fully accounting for the influence of anharmonic effects. Combined with the Lindemann criterion, we calculate and determine the solid-liquid phase transition boundary of Be up to 600 GPa. Our computational results are of particular significance for research programs related to the thermonuclear applications of beryllium and the development of Tokamak devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131368"},"PeriodicalIF":2.6,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear localized waves and positon solutions for nonlocal Boussinesq equations in shallow water applications 浅水应用中非线性局域波和非局部Boussinesq方程的位置解

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-14 DOI: 10.1016/j.physleta.2026.131341

Muhammad Hamza Rafiq , Muhammad Naveed Rafiq , Ji Lin

引用次数: 0